Auxiliary cup holder for seat back



FIG. 1 is a perspective view of an auxiliary cup holder for seat back, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof with a right side being the mirror image;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for an auxiliary cup holder for seat back, as shown. 